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Evaluation of methane emissions from the agricultural sector in Fiji

Chand, Deepitika and Mani, Francis S. and Maata, Matakite and Macanawai, A. (2017) Evaluation of methane emissions from the agricultural sector in Fiji. UNSPECIFIED.

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Abstract

Several studies have been done on methane (CH4) emissions from the agricultural sector from Asia, the United States and Australia however data from tropical South Pacific is scarce. This presentation looks at the evaluation of CH4 emissions from the agricultural sector in Fiji particularly from rice cultivation and enteric fermentation. A passive observational study using the static chamber method was done on two rice (Oryza sativa L.) varieties (Star and Totoka) to determine the seasonally integrated methane fluxes which were found to be 247.26 mg m-2day-1 and 134.27 gm-2day-1 for Star and Totoka respectively. Since there were statistically no significant differences (p-value > 0.05) between the means of the flux from the two varieties, an average flux value was used to determine the total CH4 emitted from the irrigated rice farms in Fiji. This equated to 0.06 Gg year-1 for the year 2014. The flux values obtained over the season showed a weak positive correlation with light intensity levels, atmospheric and chamber temperatures for both varieties. The other aspect of this presentation is the estimation of the total annual CH4 flux from enteric fermentation. These were determined to be 2.64 Gg yr-1, 2.46 Gg yr-1, 0.19 Gg yr-1, 0.08 Gg yr-1 and 0.03 Gg yr-1 for beef, dairy cows, goat, sheep and pig respectively based on the livestock population in 2014 using the Intergovernmental Panel on Climate Change (IPCC) models and guidelines. On a global scale, methane emissions from enteric fermentation is increasing however in Fiji there is a slow rise compared to other developed and developing countries. The total methane emissions from the agricultural sector in 2014 that includes emissions from enteric fermentation and two rice ecosystems (irrigated and rainfed) was 154179.93 tonnes of CO2 equivalent. The emission factor determined in this project will validate national greenhouse gas inventory and be instrumental in projecting future emissions from the agricultural sector.

Item Type: Other
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Science, Technology and Environment (FSTE) > School of Biological and Chemical Sciences
Depositing User: Ms Shalni Sanjana
Date Deposited: 17 Oct 2017 11:31
Last Modified: 31 May 2018 12:38
URI: http://repository.usp.ac.fj/id/eprint/10317
UNSPECIFIED

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